High Band PUCCH Resource Block Allocation for 5G UE Multiplexing
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Solution Overview
Problem
In 5G new radio (NR) wireless communications over the high band frequency spectrum above 52.6 GHz, existing technologies face challenges in achieving maximum effective isotropic radiated power (EIRP) without violating power spectral density (PSD) limitations, especially with large subcarrier spacing, which affects UE separability and multiplexing capabilities.
Innovation Solution
Configuring a base station to allocate multiple consecutive resource blocks (RBs) for physical uplink control channel (PUCCH) transmissions, allowing for increased multiplexing of UEs based on demodulated reference signal (DMRS) sequences, thereby achieving maximum EIRP without interlacing and improving UE separability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single resource block is allocated for PUCCH transmission, then the transmission structure is simple, but the number of multiplexed UEs is limited and UE separability is reduced
Solution Approach 1:
The PUCCH transmission is segmented across multiple resource blocks (at least two RBs) in the frequency domain. Each RB can carry portions of the DMRS sequences and data sequences for multiple UEs, enabling finer-grained multiplexing and improved UE separability while maintaining manageable transmission structure through organized segmentation.
Solution Approach 2:
The patent extends the PUCCH transmission from a single RB to multiple RBs in the frequency domain, adding a dimensional aspect to the resource allocation. This multi-RB approach enables additional degrees of freedom for multiplexing UEs through different RB assignments and DMRS sequence configurations, thereby increasing the number of multiplexed UEs without excessive complexity.
2Power
If interlacing is used to achieve maximum EIRP, then the power spectral density limitation is satisfied, but the UE separability and multiplexing capability are degraded
Solution Approach 1:
Instead of applying interlacing uniformly across all RBs, the patent applies different DMRS sequence configurations and lengths to different UEs within the same RB allocation. This local differentiation in sequence quality and structure enables the base station to distinguish between UEs more effectively, improving separability while maintaining maximum EIRP through alternative means than interlacing.
Solution Approach 2:
The patent changes the DMRS sequence length parameter to be at least two times the number of cyclic shifts, and configures different DMRS sequences for different UEs. This parameter adjustment enables better UE separability and multiplexing capability while achieving maximum EIRP without relying on interlacing, thereby resolving the contradiction between power efficiency and multiplexing performance.
3Productivity
If the DMRS sequence length is kept short, then the transmission overhead is reduced, but the UE separability is insufficient for multiplexing multiple UEs
Solution Approach 1:
The patent explicitly sets the DMRS sequence length to be at least two times the number of cyclic shifts, creating an optimized parameter relationship that maximizes UE separability. This parameter configuration enables sufficient distinction between multiple UEs' reference signals while maintaining efficient transmission, resolving the contradiction between sequence length and separability.
Solution Approach 2:
The extended DMRS sequence serves multiple functions: it provides reference signals for channel estimation, enables UE separability through distinct sequence patterns, and supports multiplexing of multiple UEs within the same RB allocation. This multi-functionality of the DMRS sequence justifies the increased length while delivering multiple benefits simultaneously.
Data Source
AI summary
A base station configures a physical uplink control channel (PUCCH) for a user equipment (UE) operating in a frequency band above 52.6 GHz. The base station allocates a predetermined number of resource blocks (RBs) for a physical uplink control channel (PUCCH) transmission, wherein the predetermined number of RBs is greater than one RB, transmits a PUCCH configuration including the predetermined number of RBs to the UE and receives a PUCCH transmission based on the PUCCH configuration and including a data sequence and a DMRS sequence, wherein the PUCCH configuration results in a multiplexing of a plurality of UEs based on a plurality of demodulated reference signal (DMRS) sequences.